Threading-tool.



' C. A. JOHNSON.

THHEADING TOOL.

APPLICATION FILED ocT. 7. 191s.

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A TTOR NE Y.

C. A. JOHNSON.

THREADING TOOL.

APPLICATION FILED ocT.1.1916

Patented Dec. 18, 1917.

2 SHEETS--SHEET 2.

INVETOR.

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( -A TTORNE Y.

'if Ei' STATk CHARLES A. JoNSO'N, or UNIONvinti-i.V CONNECTICUT.

',ri-IKREADINe-'roon f To all whom t may concern:

Be it known that L'CHARLES A. JOHNSON, a citizen of the United States, residing at Unionville, in the countyof Hartford and State of Connecticut, have invented a' new and Improved Threading-Tool, f which the following is a specification.v

' particularly efficient in its method lof operation and in thewoik produced thereby.

yOne form of device embodying my' invention and in the construction and use of which thefobjects herein set out, as well as others, may be attained, is illustrated in the accompanying drawings, in which.-

Figure l is a view inlengthwise vertical section through my improved threading tool. I

. Fig. 2 is a side. view of the saine with parts broken away to show construction.

Fig. 3 is an end view with parts broken away in cross section on different planes f- Y `ing-.from Vunderneath the lhead-16- to the illustrated 'by Fig.V 1'.`

Fig. 4 is an end view ofthe device, looking toward the spindle. l

Fig. 5 is a detail view, partially in lengthwise section, illustrating the construction the-'dotted *lines 3 3 of .and operation ofthe clamps for the threading dies.

Fig. 6 isY a. view in lengthwise section through a threading 1tool embodying my invention and `showing a little/different form of the cams on the actuator and lon plane denoted by dotted line 6-6 of Fig. 7.

Fi g.: 7 is a. view similar to Fig. 8 but illus- V'trating the form of actuator shown in Fig. 6.

Fig. 8 is an endzview of this form of device. 1

- Fig. 9V is ak detail view of the actuator shown in Fig. 6. L 7 I Figs. 10 and 11 are lviews illustrating the operation of thethreading dies.

In the accompanying `drawings the numeral 10 denotes the spindle of a lathe to which my improved threadingftool may be attached for the purpose. of cutting a thread upon various articles, a bolt'llbeing shown .herein for the purpose ofA illustrating the xfop'eration. Itvyvllbe understood thatthis f inventionl relates `more especially -to lthat class-ofy threading tools vthat are supi Specication ofLettersiPatent. iPa-,ented Dec,`18`1917,. Application led October 7, y191.6. Serial No. 124,274.

Ybolt .issuitably held as between the jaws of a chuck, which may be of any ordinary construction and1which,-therefore is not shown -herein. It will ybe understood that the arti-M cle,"as the bolt 11, `being threaded andthe threading tool mu'sthave relative rotation `which-the threading toolxis attached may Y' haveeitheror both o fthese movements, or may be "stationaryasqto'eitheror both of such movements, it-maybe understood for ment which may be obtained' mechanism 'well known toi those skilled: in the artV and 4forfwhich reason' such a`r showing is omitted vhereinf.V 1 f The'spindleliiis threaded as at 1.2V for at- Vtachment within a. threaded opening 313 in the body 141 *ofmy improved threader,that is secured to vthe lspindlefwith its head vv16 preferably resting against a flange V15 on; the spindle. This-body '111-' has recesses 17,

round in shape in cross section and'eXtendopposite end ofthebody to receive diesupof a-.depth alittle less-than thatof the recesses 17. Holes 20 extend from the bottom of this'groove into the openinginthe interior of the body,` these holes being preferably rectangular in shape'and other: holes `21, preferably round iii-shape, also extend from the recesses-17into the opening in `the centerof the body. An' actuator Q2 isv slidablywmount'ed in thefopening through .the body,1this actuator' having a die opening-,groove 28 tocontain dieopening membersand'a die closing groove 24 to contain .die closing members, to be hereinafter described. LAn' actua-ting rod 25 is securedy to tlie1actuator, Ya'sby means of interengaging screw threads, this rod extending within the spindle y.10, and which rod kwill receive a well known mechanism-which will be vthoroughly understood'by those'skilled inthe `i-the-presi-:nt disclosure that the spindle 10 l has both rotar-ynand longitudinal move- `ports 18 to be hereinafter described. Anwl annular .groove 19 extends around the body,

:intersecting 4the recesses .17, and preferably 85 i longitudinal'reciprocating movement bv' any,

holder.

proper position, forming round holes With-V in Iwhich the die supports or holders 18 are locatedy for reciprocating movement about their axes. The die supports or holders 18 are cut-away to form shoulders Q9 to receive the thrust of actuating plun'gers. ,These plungers may be of different constructions,

l:a preferred `form being shown herein lin whicheach plunger consists of two ballsv() each seated against a resilient thrust vmember 31, which, in thei'orm herein shown, is

a split ring. rIheseplung'ers vrest each `with yone end against ya `shoulderQ-Q onone of the die `supports and rwith its opposite end against la sizing cam 3.2 in the die opening groove 23, ythere being gone `oi? these cams jfor each of the 'plungers VThe upper ends of the die supports each have-die closing larms 83, in the constructions herein shown formed integral'therewith, and each yarm has a closing finger 34 .projecting through one of the holes :2O and :resting in contact `with a sizing cam 35, there .being .one of vthese sizing'cams to each of the fingers and hence to each of the die supports. Each of the arms is split as at B6 and an adjusting'screw 37 extends from `one rside of the lsplit portion into the opposite iside so that the slot maybe closed or permitted 'to kopen under spring action of the 4metal. vAn opening);Y cam 8S is located at one side of the grooveQB to act upon the plungers, and a closing cam 39 is located at one 'side of the groove 24 to engage and operate .the fingers 34. y

Each of the die supportsuor holders :has a `die slot Oat one end, one-wall41 of each slot being corrugated or` threaded to correspond withthe threads extendingalong y'one side of the threading die 42 secured to said rlhe end of each die is beveled 0E at the back, as lat 43 to form a cutting edge, and each threaded wall 41'has its ribs and grooves so arrangedthat thefcorresponding threaded surface of the die will be 4located `at the same angle as that oi" the lead of the Vscrew to be cut, and as shown l'clearlyy in Fig. 1 'of vthe drawings.

A 'clamped is located in the vslotin'each holder, this clamp being'wedge-shape"and .having a shank 45 proj ectingthrough a `hole -feXtending 'diagonally through the support :for holder,l the vouter end of this shank being 'fthreaded to receive a knut itaby means of @amtlich-the 'Wedge-.shaped ,clamp is drawn .into the slot to securely fasten the threading `die therein. Any other means may be employed for securing this Wedging action of the clamp. The wedge has a rib 52 itting a groove in the holder.

The actuator 22 is operatively connected with an adjusting member 47 extending through .the sleeve 27 and having` Aitsrend so engaged with the actuator that the latter `Vwill be turned when said adjusting member is turned. This result may be accomplished by an eccentriep-ineon the end `of the adjusting member engaging a `slot in the actuator, .and in the form hereinshown there fare fa. knumber of' these 'pins :and slots, ywhich'slots constitute tceth'eS ion the actuator. Any Vsuitabl v,means may be employed for rotating' the adjusting member,':as shown herein, ianangular shaped recess 50 :in the 'end of theadjusting `member being shaped to receive arwrench.

'lhecuttingends otthe'dies 4:21am moved `toward .or -romreach other for thread cut- Vting purposes by turning kthe vholders 18, and for the :purpose of adjustably positioning ythe idies in to outa thread on a bolt yof any required diameter, vtheholders are'turned by turning the actuator 22 as by'means of .the adjusting y'member 117. "This 'Stunning movement `.of the actuator lwill cause -the sizing cams '32 to'move the opening 'plungers outwardly andv this'same `turning movement of the actuator will cause the cams'v35 kto `permit 'the fingers 3e 'to move inwardly toward the aXis'ov the tool. That `is,fthese two sets of sizing cams are so arranged that when the opening plungers are moved out- 'wardly the idie supports or holders may turn because the fingers .'34 are permitted "to `=move inwardly. This same movementV may be employed to take up wear-to a rcertain eX- 'tent, Vand the iingers 34 arev each adjusted to 'rest properly .against their lcams'by 'use oifthe adjusting screws "37, as hereinbefore explained.

rThe machine to which the threading tool is attached being-1in :operation the actuator 22 is reciprocatedfin aiifax'ialrlirec'tion zat the proper times by meansof the actuating rod Q5 as herein'before explained. As this Arod is moved in onerd-irection the opening cam '3S engaging thezopenin g plungers; will force -them outwardly, turning the die 'supports in a direction to open the dies. This samemovement fplaces the groove'QA opposite the ends of the fingers that are caused to :move into theV groove. As ,the actuator is moved in lthe .opposite direction by means of the actuating rod 'the fingers 34 are 4forcedr apart, the closing cam'v 319 turning the -die eholders ina position to vclose the dies. 'This closing movement of the actuator places they groove- 23 opposite the opening .plungers that are caused to-inove down the faopening camfand into/:Said grooves, Inf-this operation the rod 25'will be moved in the proper direction and this movement will be so timed to operate the actuator to open the dies when they have passed from the end of the bolt'll along thelatter to theipoint at which it is desired the thread shallterminate, and to close said dies after the bolt and dieshave been separated to an extent to carry the bolt clear from'said dies. It will be understood that this movement of the rod rtakes place to the necessary extent independently of the movement of Ythe spindle. The adjusting member 47 is held in place by a retaining screw 63, the end of which is located in a retaining groove 64 in said member. This retaining screwhas slotsy65 out across it at certain intervals so that it will yield to a certain extent lengthwiseand thus provide for a resilient contact `with In? threading an article the diesAare-forced onto such article from the end thereof, and to such an extent as itis desired that`the thread shall be cut. l y

The die as embodied linthe form illustrated'in Figs. 6, 7, and S is particularly adapted for cutting lthreads peculiar to wood screws or bolts, and for cutting this thread in al single movement of the dies across the piece. In cutting this thread the operation begins at that'point nearest the head on the screw atv whichr the thread terminates and the cuttingoperation is toward the point of the screw. i To effect this result the actuator is operated to open thedies 51 as the article to be threaded and the threading tool approach one another,

- whereas in the form of the device above described a reverse operation takes place;

' to 8 inclusive.

a In the device fhereinbefore described there are two formationsup which the plungers :and fingers ride in the operation' ofv the dev1ce,.whereas 1n the device of F1gs.v6 to 8 inclusive,.these cam surfaces are on opposite sides of a single formation! 53located=.be tween'the depressionsl or recesses'that re-k ceive the plungers and ngers. It will, howtions are formed at the end of recesses eX- tending. lengthwise of the actuator instead laround `the actuator as of at ythe end of recessesextending :entirely shown in Figs. 1 to .Linclusive.` f f In the device of Figs. 6to 8 inclusive the actuator 54is attached tothe rod 25 in the same manner as in the other device. 'f This actuator is retained withinthe body of the threader as by means `of a retaining lscrew 55 that projects through the body into a retaining recess 56 inthe actuator. This actuator has a series of forming recesses 57 located at one end of the actuator and another series of' forming recesses 58 located yat the other end of the actuator, the plungers projecting into the recesses first-mentioned and the fingers 34 projecting into the recesses last mentioned. It will be-noted that .the bottoms ofthese recessesare of a form `to -regulate the opening and closing movements of the' dies so 'that after theytare closed on to the blanlr62 they will run` along without opening-or closingmovement until the body of the screwl 61 is cut, and then thezdies1 are 'caused to rapidly close together to enable v the pointing edges 59 ofthe dies 51 to rapidly cut olf .the end ofthe screw Aand form the usual-point thereon. The structure is such andthe diesare so formed that .I am able to cut la, forin of thread common to screws that rare'used iniwoodin a'singley passage of the dies across' the blank and tof form the point of Vthel screw invthis'same operation. The operation 'of the device shown in` Figs. 6 to'8 will be readily understood from the description hereinbeforev It will be noted that the threaded 'interengaging surfaces of the ldies 42 andthe walls 41 of the slots'40 cause the dies to'bealways insertedl in theproper positionH inthe slots, and the pressure exerted upony the dies in the cutting operation is such as to set together 'the threaded grooved surfaces,

should they for anyreasonfbe slightly disengaged. This engagementV of vthel threaded 'cutting surface, `of' each die with a. correspending threadedl surface ofthe die slot :is

lan important feature f my invention, as

each die is necessarily held solely by the inn -f terenga'ging threaded'surfaces. Another important-'feature resides in that construction of the die holder k,whereby the cutting tools each press .upon one side of the'article being -'threaded,rand the arms and fingers 34each press against the actuator upon substantially-the diametrically opposite side ofthe structure froml that engaged by its cutting tool. The diesy engaging an article :being threaded on all sides thereof,zit forms at this time substantially an integral part of Ithe structure,` and the'y thrust upon leach -holder caused lby the cuttingacticn of: its Vtool resisted'throughfits arm andfinger by substantially; the same structure and f. vupon L the. opposite :Iside of: .,the; axis` .thereof i 'zor from'that engaged by lthe tool, so that the forces are, in a manner balanced. This structure prevents all vibration or chatter of the tool in use.

When the tool is arranged to cut the thread beginning at that end opposite the point the spindle Will be turned to the left and consequently the screu7 thread engaging the head 16 will be a left-hand thread instead of a right hand thread as in the form .of the device shown in TEig. 1. It will be noted that the surface engaged -by the fingers 34 at the Vbottom of the recesses 58 is much shorter than the length of the thread :upon the screw 6l that is cut by the voperation of this device. The independent movement-of theV actuating rod 25 .enables the thread on the screw 61 Vto be cut, employing this short surface in the recess 58, the actuator .being given a movement through the medium of the rod toan extent to' keep the fingers 34C in lcon-tact With the surfaces of the bottoms ofthe recessesS for a time sufli- :cient to enable `the thread to be cut, during Which time the dies are performing the cutting operationen the main part of the screw thread.

In accordance With the provisions of the :patentstatuteml have describedL the principles yof operation of my invention, Itogetherivith the apparatus Which I now consider to represent the best embodiment thereof; ,butI desire to have it understood that vthe apparatus shown is only illustrative, `and that the invention can be carried out by other means Within the scope of the appended claims.

'I claim:

LA rotatable body, a die holder mounted in fthe body to rotate on its longitudinal .axis. an actuator movably mounted Within the body to impart reciprocating movement 4to said holder .on its axis, connections be- 4.tWeenrthe actuator and the die holder for positively moving said holderin both directions of ,a reciprocating movement, and means extending i-nto the end ofthe body and connected with said actuator to operate it.

2. A rotatable Vbody, a die holder rotaftably `mounted in the body, an actuator movably :mounted `in the body and having cams, -to impart reciprocating Amovement to ksaid lholder on its axis,connections from the die holder engaging said cams to positively Ymove the holder in both directions of a .re-

ciprocating movement. a-nd means extending :intol the fend of the body and connected with said actuator to operate it.

8. A rotatable body` a 'die holder rotatably mounted in the body-for reciprocating lmovef-ment on itsa'xisyand having a finger rigidly f' connected therewith,A a plunger loperatively vconnected With the holder, `and ran .actuator :mommy-@mounted inthe. body and. hav-ing cams to Vengage said plunger and said .a plunger operatively connected With the holder, and an actuator movably mounted in the body and having recesses to receive said finger and plunger and With cams `at the edges of said recesses to movesaid finger and plunger.

5. A rotatable body, -a die holder mounted inthe body to rotate onvits longitudinal axis therein, an vactuator mounted for longitudinal and rotatable movements in the body, connections between the actuator and the die holder to impart bothof said movements of the actuator to said holder and means extending into the end of the body and oper- -atively connected With said `actuator to operlate it.

.6. A rotatable body, a' die holder rota-- tably mounted in the body, an actuator mounted for longitudinal and rotatable movements in the axial center ,of the body, one of Which movements is lan adjusting movement and vthe other an vactuating movement, connections between the actuator and the holder to impart both of saidmovements to said holder, and means extending into the end of ythe body and operatively connected With said actuator to operate it.

7. A rotatable body, a .die holder rotatably mountedfin .the body, an actuator mounted for longitudinal :and rotatable movements in the axial center of the body, said actuator having adjusting cams `.and actuating cams, connections Ybetween the .actuator and holder and both of said cams to impart both of ,said movements of the actuator to the holder and means extending `into the .end of the body and -operatively connected with said actuator to operate it.

V8. A rotatable body, a die holder rotatably mounted in the body, an actuator mou-nted for longitudinal and rotatable movements in the axial center of the body, connections between the actuator and holder -to impart both of .said movements of the (actuator to said holder, said connections the h-older in both Idirections of a recipro- 1 cati-ngmovement and means extending into :the y.end of the body and operatively connected with said actuator to operate it.

9. A rotatable body,ra die holder mounted .in the body, an actuatormounted for longietudinal and rotatable movements kin the axial .f in botti-fdirectionsofia reciprocatingmove- -also 4including means for positively Amoving ment and means exten-ding vinto'theend i of the body and operatively connected with said actuator to operate it. Y

10. A' rotatable body, a die holder rotatably mounted in the body, an actuator mounted for longitudinal and vrotatable movements in the axialfcenter lofthe body, said actuator having cams to operate in both of said movements, a connection between the holder and `one of said cams to move the holder -for adjusting purposes, and to engage with the other cam on the actuator to move the holder for feed purposes and means extending into the end of the body and operatively connected with said actuator to operate it.

11. A rotatable body, a die holder rotatably mounted in the body, an actuator mounted for longitudinal and rotatable movements in the body, said actuator having recesses with cam faces in the bottom and edges thereof, and connections between said holder and said actuator, said connections extending into said recesses for operation by all of said cams to positively move the actuator in both directions of its reciprocating movement.

12. A rotatable body, a die holder rotatably mounted in the body and having a linger connected therewith, an actuator mounted for longitudinal and rotatable movements in the body and having recesses withcams thereon, one of which recesses receives said finger, and a plunger connecting the actuator with the other of said recesses.

13. A rotatable body, a die holder rotatably mounted in the body, an actuator mounted for longitudinal .and rotatable movements in the body and having a recess with a cam at its bottom extending in a peripheral direction, a cam at its edge extending in a longitudinal direction, and a connection between the actuator and holder to operate the latter by both of said cams.

14. A rotatable body, a die holder rotatably mounted in the body, an actuator mounted for rotatable and longitudinal movements in the body, said actuator having recesses each with a peripherally eX- tending cam at its bottom and a longitudinally extending cam at its edge, and a member projecting into both of said recesses and operatively connected with the die holder.

15. A rotatable body, a die holder mounted in the body, an actuator mounted for rotatable movement in the body, and a resilient plunger connecting the actuator and holder and transmitting the movement of the former to the latter.

16. A rotatable body, an actuator movably mounted in the body, a holder movably mounted in the body, and a plunger consisting of a resilient ring with balls on opposite sides of` said ring operatively connecting the actuator land holder.

17. A rotatable body, adie holder mounted i tion engaginga recess in the actuator where-v by operationof theadjustable member will rotate theactuator. v Y

18. A rotatable body, a die holder mounted in the body, an actuator mounted in the body and operatively connected with the die holder. an ladjustable member for said actuator, and a retaining screw for said adjustable member, said retaining` screw being split laterally tov cause resilient action.

19. A rotatable body, a die holder projecting at the lower end of the body and having a slot with a threaded wall therein, said slot extending across said holder, a die having a flat threaded surface to constitute the cutting end thereof, the threaded wall of said slot corresponding to that of said die, and means for holding the two threaded surfaces in engagement to retain the die in place in the slot.

20. A body part, a holder movably mounted in the body and having a die slot in one endextending across said holder and with a threaded wall, a die having a threaded surface extending lengthwise thereon and constituting the cutting end, the threaded surface of said wall corresponding to that of said die, a clamp to force the threaded surfaces of the die and slot into engagement, and means for operating the die holder.

21. A body part, an actuator movably mounted in the body, a holder movably mounted in the body and having means to support a tool to engage an article to be threaded on one side thereof, a projection from said holder to engage the actuator upon the opposite side Vonly of the axis of the holder from the point engaged by said tool, whereby the forces to move the cutting die into operative position and the force to resist its action are balanced, and means to operate the actuator.

22. A body, a die holder mounted for turning movement in the body, said die holder having a shoulder, an actuator located within the body and having a bearing surface, means for moving the actuator, and a plunger having one end in engagement with said bearing surface and the other end arranged to engage said shoulder whereby the tool holder is operated by force applied to one side only of said holder and through a movement of the actuator.

23. A rotatable body, and die holder projecting at the lower end of the body and having a slot with a threaded wall therein, said slot extending across the holder, a die having a: flat threadedl surface extending to and constituting the cutting end thereof, the threadedV Wall of said slot corresponding to that of said die, and the threads on said Wall being located at the same angle with respect to the axis oi the article to--be threaded as the lead of the screw on said article.

24. A rotatable body, an actuator mounted on. the body,l means for adjustingthe actuau torabout its axis, a die holder mounted in the body androtatable on its longitudinal axis and having an:` arm extending therefrom Witha nger to engage thel actuator, saidv arm, being split, and meansvgfor expanding and contracting the split portiony to adjust Y the position of said arm.

axis, and aplural number of connections be-f tween theactuator and die holder `for posi-vV tively moving saidV holder in bothy directions of a reciprocating; movement.

i crimenesz A.. JoHNsoN.

Copies of this patent may be obtanedrol `five cents each, by addressing the Commissioner 02.1a1ents,

Washington, D. 63.. 

